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I'm sending emails with an HTML version for capable clients (isn't that virtually all nowadays?). My worry is how to style it. Do I use inline css? Can I include the stylesheet in the html? Does the html begin with <html> or <body>? Is there a standard I can read on this?
How far can I go in styling? I have border-radius, background gradients, etc that have natural fallback mechanisms for browsers that don't support it (IE). For IE, I use PIE.htc, I assume that's going too far...